Dual converter engine exhaust system for reducing hydrocarbon emissions

Patent · Tue Jun 30 00:00:00 EDT 1992

OSTI ID:7280367

Patil, M D; Socha, Jr, L S; Lachman, I M

This patent describes an exhaust system for the conversion of hydrocarbons in an exhaust stream from an engine. It comprises first catalytic converter means for substantially converting hydrocarbons in a hydrocarbon-containing engine exhaust stream to water and carbon dioxide, second catalytic converter means, situated farther from the engine than the first means, one or more conveying means for selectively conveying the engine exhaust stream within the engine exhaust system, whereby the conveying means operate to convey, during a first period of time prior to the first catalytic converter means; convey, during a second period of time subsequent to the first catalytic converter means; and convey, during a third period of time subsequent to the molecular sieve means having attained its desorption temperature, a portion of the exhaust stream from the first catalytic converter means and then recycle substantially all of the exhaust discharged from the second means back to either the engine or to the first means, and the remainder of the exhaust stream from the first means to the atmosphere, bypassing the second means.

• Assignee: Corning Inc., Corning, NY (United States)
• Patent Number(s): A; US 5125231
• Application Number: PPN: US 7-535325
• OSTI ID: 7280367
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330704* -- Emission Control-- Hydrocarbons
ADSORBENTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYTIC CONVERTERS
CHALCOGENIDES
CONTROL
CONVERSION
DESORPTION
ENGINES
EQUIPMENT
EXHAUST SYSTEMS
HYDROCARBONS
HYDROGEN COMPOUNDS
MOLECULAR SIEVES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SORPTION
WATER